Chemical equilibrium of trioctylmethylammonium chloride with aqueous solution of Cr(VI)

Abstract

The distribution and dissociation equilibria of phase-transfer catalyst, trioctylmethyl-ammonium chloride (Q ⁺Cl⁻ ), for the system of QCl–toluene–aqueous HCrO₄ ⁻ solutions were measured at 298K for the systems of toluene–water or –aqueous electrolyte solutions.

The evaluated distribution coefficients of trioctylmethylammonium chloride and the complex formed between trioctylmethylammonium cation and HCrO₄ ⁻ were correlated as a function of the ionic strength in the aqueous solutions. The dissociation constants, K ₁ and K ₂, were independent of ionic strength.

Keywords:

• Distribution coefficient
• Dissociation constant
• Trioctylmethylammonium chloride
• Ionic strength
• Salting-out parameter

Acknowledgments

This work was supported by Grant No. 2000-2-30700-002-3 from the Basic Research Program of the Korea Science & Engineering Foundation.